Ferdinand is buying shirts. The store sells t-shirts for $20 each and collared shirts for $30 each. He needs a certain number of shirts but is on a budget. The graph below represents the number of t-shirts, , and collared shirts, , that he can buy.
What is the system of inequalities represented by the graph?

17. a researcher measures three variables, x, y, and z for each individual in a sample of n = 20. the pearson correlations for this sample are rxy = 0.6, rxz = 0.4, and ryz = 0.7. a. find the partial correlation between x and y, holding z constant. b. find the partial correlation between x and z, holding y constant. (hint: simply switch the labels for the variables y and z to correspond with the labels in the equation.) gravetter, frederick j. statistics for the behavioral sciences (p. 526). cengage learning. kindle edition.